JP2005253300A5 - - Google Patents

Claims (3)

A power conversion device that converts DC power of a DC power source into AC power;
An AC motor that is rotationally driven by the AC power of this power converter,
An AC short circuit provided on the AC output side of the power converter, causing the AC motor to short-circuit when control of the power converter is stopped, and generating a braking force;
The armature short circuit has a phase advance capacitor inserted in series to improve the power factor of the AC motor by advancing the current phase at the time of the armature short circuit and to secure a necessary braking force. AC motor drive device.   The current short circuit is characterized in that a current limiting resistor for limiting the current at the time of the amateur short circuit to make the AC motor below a maximum rated current is inserted in series with the phase advance capacitor. 2. The AC motor drive device according to 1.   A control device for an elevator that includes a permanent magnet synchronous motor and uses a dynamic braking circuit that short-circuits each phase terminal of the permanent magnet synchronous motor via an impedance,
  A capacitor for short-circuiting each phase terminal of the permanent magnet synchronous motor when forming a dynamic braking circuit;
  An elevator control device comprising: a switch for switching and connecting each phase terminal of the permanent magnet synchronous motor from a drive circuit to the capacitor.